The presentation introduces the adapter design pattern, which allows classes with incompatible interfaces to work together by converting the interface of one class into another interface expected by clients. It provides real-world examples of adapters, such as memory card readers and power adapters. The presentation also includes a class diagram demonstrating how an adapter pattern can translate between a target class and adaptee class. It notes some problems and forces of the adapter pattern, such as increased overhead, and concludes that the pattern helps developers write cleaner, more maintainable code while following SOLID principles.

1. Presentation on
Adapter Design Pattern
Presented by
Tanim Ahmed (1507113)
Md. Zabirul Islam (1507110)
Md. Motaleb Hossen Manik (1507114)
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2. Do you know what is adapter pattern?
▪ The adapter pattern convert the interface of a class into another interface that
clients expect. Adapter lets classes work together that couldn’t otherwise because
of incompatible interfaces.
▪ Wikipedia says…
▪ In software engineering, the adapter pattern is a software design pattern that
allows the interface of an existing class to be used as another interface. It is often
used to make existing classes work with others without modifying their source
code.
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3. In real life example
Consider that you have some pictures in your memory card and you need to transfer them to your
computer.
In order to transfer them you need some kind of adapter that is compatible with your computer ports
so that you can attach memory card to your computer.
In this case card reader is an adapter. Another example would be the famous power adapter;
a three legged plug can't be connected to a two pronged outlet,
it needs to use a power adapter that makes it compatible with the two pronged outlet.
Yet another example would be a translator translating words spoken by one person to another
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4. Adapter…
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5. ANOTHER EXAMPLE
▪ Real Life Example of Adapter Pattern:
suppose I am a ProgrammingTeacher, and I have two types of
students in my class, the American students and the Bangladeshi
students, since my American students don’t understand Bangla, i
have to have a translator that will translate my lectures to my
American students.
▪ In this example, a Student class will be theTarget, the translator will
be the Adapter, and the American students will be the Adaptee, like
the class diagram below:
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6. Class Diagram Of Adapter Pattern
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student
translator American student

7. Context
▪ Context:
▪ You are building an inheritance hierarchy and want to
incorporate into it an existing class.
▪ The reused class is also often already part of its own
inheritance hierarchy.
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8. Adapter Pattern
Problem Continued…
▪ Some problems are faced during designing any system using Adapter
design pattern
▪ When there is polymorphism
▪ There may have function with same name but with different
signature
▪ User may have written a separate class for a specific task. But as the
user should go through Polymorphism, this separate class is unused.
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9. Adapter Pattern
Problem Continued…
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Here is already written class called xyzcircle that deals with
circles already. But we can’t use directly because we want to
preserve polymorphic behavior with Shape

10. Adapter Pattern
Forces
▪ Some languages may not support multiple inheritances (e.g. Java)
▪ More forwarding requests
▪ Increase in the overhead
▪ Adapter chaining in created to reach to specific type
▪ Complex adaptation
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11. 11
Adapter Pattern Design example

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Summary
▪ The Adapter Pattern is extremely useful when combined with
SOLID design principles and it helps developers to write a cleaner
and more maintainable code.

13. References
▪ 1. https://www.slideshare.net/adeelr456/adapter-design-pattern-
45257387
▪ 2.https://www.slideshare.net/adeelr/qid=4ce8b50c-e14a-4cbb-8b62-
82ba26259f22&v=&b=&from_search=2
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14. ThankYou
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